CN211549944U - Water supply system for rail vehicle - Google Patents
Water supply system for rail vehicle Download PDFInfo
- Publication number
- CN211549944U CN211549944U CN201922131310.8U CN201922131310U CN211549944U CN 211549944 U CN211549944 U CN 211549944U CN 201922131310 U CN201922131310 U CN 201922131310U CN 211549944 U CN211549944 U CN 211549944U
- Authority
- CN
- China
- Prior art keywords
- water
- emptying
- pump
- water supply
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fluid-Driven Valves (AREA)
Abstract
The utility model relates to a water supply system for rail vehicle, including water tank and water pump, the water tank passes through the water intake pipe and is connected with the water pump, the water pump passes through the water supply pipe and is connected its characterized in that with water equipment: the water pump is a pneumatic diaphragm pump, the pneumatic diaphragm pump is connected with an air pump electromagnetic valve, and the air pump electromagnetic valve is connected with a vehicle air source through an air supply pipeline and is connected with a control system through a line. The utility model discloses the structure is simpler, and the cost is lower, and solenoid valve case scale deposit and lead to solenoid valve jamming scheduling problem when effectively having avoided adopting electric water pump ensures that water supply system job stabilization is reliable, and the fault rate is lower.
Description
Technical Field
The utility model relates to a water supply system, in particular to water supply system for rail vehicle belongs to rail vehicle and makes technical field.
Background
The water supply system is an important component of the design of the rail vehicle, is one of essential basic conditions for passenger journey and life, and is also an important aspect of humanized service of a passenger train. Along with the development of railway passenger cars, the design requirements on a water supply system are continuously improved, and the system is required to be reasonable and reliable in structure. The existing rail vehicles, such as ordinary railways, motor train units, high-speed rails and the like, have no more than two types of water supply systems, namely natural pressure type water supply on the vehicles and pressure type water supply under the vehicles, wherein the pressure type water supply under the vehicles is divided into two water supply modes, namely air pressure type water supply and pump type water supply. At present, a pump type system mainly adopts an electric water pump, but the normal work of the electric water pump is ensured, the frequent start and stop of a motor are avoided, the design of a water supply system is complex, the number of components is large, the price is high, the electric water pump cannot idle, and the self-priming function is absent. In addition, the water supply system adopting the electric water pump adopts the electromagnetic valve to directly control the water channel, and the electromagnetic valve can scale the valve core after being used for a long time, so that the electromagnetic valve is blocked and the use of the water supply system is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a structural design is simple reliable, and is with low costs, ensures water supply system for rail vehicle reliable and stable operation of water supply system.
In order to achieve the above purpose, the technical scheme of the utility model is that:
the utility model provides a water supply system for rail vehicle, includes water tank and water pump, the water tank passes through water intake pipe and is connected with the water pump, the water pump passes through the water supply pipe and is connected with water equipment, the water pump is pneumatic diaphragm pump, pneumatic diaphragm pump is connected with the air pump solenoid valve, and the air pump solenoid valve passes through the air supply line and is connected with the vehicle air supply and be connected with control system through the circuit.
Further, install into water gas accuse valve on the inlet line, it connects into water gas accuse solenoid valve to advance water gas accuse valve, it is connected with control system and is connected with the vehicle air supply through the air supply pipeline to advance water gas accuse solenoid valve through the circuit.
Further, be connected with first clear pipe on the water inlet pipe way, install first clear air accuse valve at first clear pipe, first clear air accuse valve is connected first clear solenoid valve, and first clear solenoid valve passes through the circuit to be connected with control system and is connected with the vehicle air supply through air supply line.
Furthermore, a second emptying pipe is connected to the water supply pipeline, second emptying pneumatic control valves are respectively mounted on the second emptying pipes, the second emptying pneumatic control valves are connected with second emptying electromagnetic valves, and the second emptying electromagnetic valves are respectively connected with the control system through pipelines and the vehicle air source through the air supply pipeline.
Further, the set air pressure of the second emptying pneumatic control valve is N times of the set maximum water pressure value in the water supply pipeline, and when the water pressure reaches the set maximum water pressure value, the second emptying pneumatic control valve is opened passively to release the pressure.
Further, an air source pressure switch is installed on the air supply pipeline and connected with the control system.
Furthermore, a water pressure switch is installed on the water supply pipeline and is connected with a control system.
Furthermore, a flow switch is installed on the water supply pipeline and is connected with a control system.
Further, a manual emptying valve for manually emptying the water pump when the system fails is installed on an air supply pipeline of the water pump.
In summary, the utility model provides a water supply system for rail vehicle utilizes pneumatic diaphragm pump to replace the electric water pump among the prior art, makes system architecture simpler, and the cost is lower, has effectively avoided the solenoid valve case scale deposit and leads to solenoid valve jamming scheduling problem when adopting electric water pump, ensures water supply system job stabilization reliable, and the fault rate is lower.
Drawings
FIG. 1 is a schematic diagram of a water supply system of the present invention.
As shown in fig. 1, a water tank 1, a water injection pipe 2, a water tank emptying valve 3, a ventilation overflow pipe 4, a first emptying pneumatic control valve 5, a first emptying electromagnetic valve 6, a pneumatic diaphragm pump 7, an energy storage tank 8, a second emptying electromagnetic valve 9, a second emptying pneumatic control valve 10, a deflation valve 11, a hydraulic pressure switch 12, a flow switch 13, a stop valve 14, a filter pressure reducing valve 15, an air source pressure switch 16, an air pump electromagnetic valve 17, an intake pneumatic control electromagnetic valve 18, an intake pneumatic control valve 19, a liquid level switch 20, a manual stop valve 21, an intake pipeline 22, a water supply pipeline 23, an air supply pipeline 24, a water-using device 25, a first emptying pipe 26, a second emptying pipe 27 and a manual emptying valve 28.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings:
as shown in fig. 1, the utility model provides a pair of water supply system for rail vehicle, including water tank 1, water pump and pipeline, in this embodiment, the water pump adopts pneumatic diaphragm pump 7, provides the pressure water through pneumatic diaphragm pump 7, supplies water for water equipment 25 such as wash-basin, electric boiler, stool pot. The water tank 1 is connected with the inlet of the pneumatic diaphragm pump 7 through a water inlet pipeline 22, and the outlet of the pneumatic diaphragm pump 7 is connected with a water using device 25 through a water supply pipeline 23.
Install water injection pipe 2, empty pipe (not marking in the figure) and air vent overflow pipe 4 on the water tank 1, the bottom at water tank 1 is installed to the pipe that empties, installs the water tank on the pipe that empties and empties valve 3, and the water tank is emptied valve 3 and is manual valve or for pneumatic valve, opens when needing to empty the water of depositing in the water tank 1, is in the closed condition during the use. In this embodiment, it is preferred that water tank emptying valve 3 adopts the gas accuse valve, and water tank emptying valve 3 adopts the normally closed valve, and when water supply system standby, shut down, water tank emptying valve 3 all is in the closed condition of cutting off the gas supply, and only when carrying out the action of emptying of water tank 1, control system can control water tank emptying valve 3 and ventilate and open, all empties the water of depositing in the water tank 1. The ventilating overflow pipe 4 can be used for keeping the interior of the water tank 1 in a normal pressure state all the time, and smooth water supply is ensured. Five liquid level switches 20 for detecting different liquid levels in the water tank 1 are further mounted on the water tank 1 and are used for detecting five liquid levels of 0%, 25%, 50%, 75% and 100% respectively.
An air inlet control valve 19 is installed on the water inlet pipeline 22 between the water tank 1 and the pneumatic diaphragm pump 7, and the air inlet control valve 19 is a normally closed valve and is used for selectively connecting and disconnecting the waterway connection between the water tank 1 and the pneumatic diaphragm pump 7. The water inlet pneumatic control valve 19 is connected with the water inlet pneumatic control electromagnetic valve 18, and the water inlet pneumatic control electromagnetic valve 18 is connected with a control system through a control circuit and is connected with a vehicle air source through an air supply pipeline 24. When the water supply system is in standby, the air inlet pneumatic control valve 19 is in an open state (or when the air inlet pneumatic control valve 19 is in an air-off closed state in standby, but when the pneumatic diaphragm pump 7 works, the air inlet pneumatic control valve 19 is in an open state), and when the water supply system is stopped, the air inlet pneumatic control valve 19 is in an air-off closed state. A manual stop valve 21 is installed on an inlet pipeline 22 on the inlet side of the water inlet pneumatic control valve 19 and used for manually cutting off the water inlet pipeline 22 when the pneumatic control valve is not used, and the water channel connection between the water tank 1 and the pneumatic diaphragm pump 7 can be disconnected when the pneumatic control valve is used for maintenance, so that the maintenance is convenient.
The pneumatic diaphragm pump 7 is connected with an air pump electromagnetic valve 17, the air pump electromagnetic valve 17 is connected with a vehicle air source through an air supply pipeline 24, the air pump electromagnetic valve 17 is connected with a control system through a control line, and the air pump electromagnetic valve 17 controls the start and stop of the pneumatic diaphragm pump 7. A silencer is mounted on the pneumatic diaphragm pump 7 to reduce exhaust noise. Because the pneumatic diaphragm pump 7 has the self-absorption function, when the system is subjected to anti-freezing emptying, the control system can control the pneumatic diaphragm pump 7 to act to empty water in the pneumatic diaphragm pump 7, a drain pipe which is required by the electric water pump and used for draining residual water in the water pump is omitted, meanwhile, the pneumatic diaphragm pump 7 is used for replacing the electric water pump as a power source, an air suction switch and a large-flow switch are not needed, the system structure is simplified, and the cost is reduced. In addition, because the pneumatic diaphragm pump 7 has a self-absorption function, the water inlet pneumatic control valve 19 can be omitted according to actual conditions, the system is further simplified, and the cost is reduced.
In order to empty the water in the water inlet line 22 and the water supply line 23, a first emptying pipe 26 is connected to the water inlet line 22, and a second emptying pipe 27 is connected to the water supply line 23, so as to empty all the water in the water inlet line 22 and the water supply line 23 when not in use. A first emptying pneumatic control valve 5 is installed on the first emptying pipe 26, the first emptying pneumatic control valve 5 is connected with a first emptying electromagnetic valve 6, and the first emptying electromagnetic valve 6 is connected with a control system through a line and is connected with a vehicle air source through an air supply pipeline 24. And a second emptying air control valve 10 is installed on the second emptying pipe 27, the second emptying air control valve 10 is connected with a second emptying electromagnetic valve 9, and the second emptying electromagnetic valve 9 is connected with a control system through a line and is connected with a vehicle air source through an air supply pipeline 24. The first emptying pneumatic control valve 5 and the second emptying pneumatic control valve 10 are both normally open valves, when the water supply system is in standby, the first emptying pneumatic control valve 5 and the second emptying pneumatic control valve 10 are both in a ventilation closed state, when the water supply system is stopped, the first emptying pneumatic control valve 5 and the second emptying pneumatic control valve 10 are in a gas-off open state, and the system automatically empties water stored in the water inlet pipeline 22 and the water supply pipeline 23.
The set air pressure of the second air control valve 10 is N times, preferably 3 times, of the maximum water pressure in the water supply pipeline 23, if the set air pressure of the second air control valve 10 is 600kPa, the maximum water pressure in the water supply pipeline 23 is set to 200kPa due to system failure, so that the tightness during normal water supply can be ensured, and meanwhile, when the water pressure is too high due to system failure, as long as the water pressure reaches 200kPa, the second air control valve 10 is forced to be opened to realize pressure relief, and further the system safety is ensured.
The stop valve 14, the filtering and pressure reducing valve 15 and the air source pressure switch 16 are connected in series on the air supply pipeline 24 in sequence. The shutoff valve 14 is opened in a standby state, and closes and shuts the gas passage when maintenance is performed. The filtering pressure reducing valve 15 is used for reducing the air source pressure to meet the working pressure requirement of each pneumatic component, and the air source pressure switch 16 is used for detecting the air source pressure and cutting off the air source of each pneumatic component when the air source pressure is abnormal, so that the pneumatic component stops working.
An energy storage tank 8, a vent valve 11, a hydraulic pressure switch 12 and a flow switch 13 are sequentially arranged on a water supply pipeline 23 at the outlet end of the pneumatic diaphragm pump 7. Energy storage tank 8 is used for preventing that pneumatic diaphragm pump 7 from frequently starting, and when pipeline terminal water consumption was less than 0.7L, pneumatic diaphragm pump 7 can not start, and this design reduces the number of times that pneumatic diaphragm pump 7 opened and stops, and increase of service life can guarantee that the pressure of pipeline is more steady.
The start and stop of the pneumatic diaphragm pump 7 are controlled by a hydraulic pressure switch 12, in the embodiment, the set value of the hydraulic pressure switch 12 is 150 kPa-300 kPa, and the pneumatic diaphragm pump 7 works in the range. When the train uses water, the pipeline pressure will gradually decrease along with the water output of the pipeline, and when the pipeline pressure decreases to a certain value (namely 150 kPa), the hydraulic pressure switch 12 will control the corresponding pneumatic diaphragm pump 7 to operate through the control system; when the train does not use water, the pneumatic diaphragm pump 7 continues to operate until the corresponding water pressure switch 12 detects that the pressure of the water supply pipeline 23 reaches 300kPa, the pneumatic diaphragm pump 7 stops working, and the service life of the pneumatic diaphragm pump 7 is prolonged. The device provides stable water supply pressure for the train through effective pressure control, ensures that the pressure of the water end for the train is in a very small range, and the pressure in the water supply pipeline cannot be impacted due to overlarge pressure range.
The flow switch 13 is used for detecting the leakage flow of the water supply pipeline 23, the flow switch 13 is connected with the control system, the flow switch 13 is used for detecting whether the train water supply pipeline and the terminal water equipment have leakage, in the embodiment, the set flow of the conduction of the flow switch 13 is preferably (1 +/-0.2) L/min.
In this embodiment, a manual emptying valve 28 is further installed on the air supply pipeline 24 of the pneumatic diaphragm pump 7, and when the system fails, the manual emptying valve 28 can be manually opened to manually supply air to the pneumatic diaphragm pump 7 and discharge water stored in the pump cavity.
The working process of the water supply system is as follows:
A. first power-on
After the system is powered on for air supply, the first emptying pneumatic control valve 5 and the second emptying pneumatic control valve 10 on the first emptying pipe 16 and the second emptying pipe 27 which are connected with the water inlet pipeline 22 and the water supply pipeline 23 are closed, the air source pressure switch 16 judges that air exists, the liquid level switch 20 of the water tank 1 judges that water exists, the water inlet pneumatic control valve 19 is controlled to be opened, the air pump electromagnetic valve 17 of the pneumatic diaphragm pump 7 is opened for air supply, and the pneumatic diaphragm pump 7 is started. When the pressure of the water supply pipeline 23 rises to the upper limit value set by the hydraulic pressure switch 12, the control system controls the stop standby state of the pneumatic diaphragm pump 7 and controls the closing of the water inlet pneumatic control valve 19.
B. Pneumatic diaphragm pump 7 start-up
When the pressure of the water supply pipeline 23 is reduced to the lower limit value set by the hydraulic pressure switch 12, the control system controls the water inlet pneumatic control valve 19 to be opened, the air pump electromagnetic valve 17 is opened for air supply, and the pneumatic diaphragm pump 7 is started.
C. Pneumatic diaphragm pump 7 stops
When the pressure of the water supply pipeline 23 rises to the upper limit value set by the hydraulic pressure switch 12, the control system controls the water inlet pneumatic control valve 19 to be closed, the air pump electromagnetic valve 17 to be closed and cut off air, and the pneumatic diaphragm pump 7 stops working.
The control method further comprises a water system fault detection step, specifically, when the pressure of the water supply pipeline 23 is reduced to a lower limit value set by the water pressure switch 12, after the pneumatic diaphragm pump 7 continuously works for t1 minutes, the water pressure still does not reach the upper limit value of the water pressure switch 12, the pneumatic diaphragm pump 7 stops working, after t2 minutes, the control system controls the pneumatic diaphragm pump 7 to work again for t1 minutes and then stops working, after t2 minutes, the control system controls the pneumatic diaphragm pump 7 to work again for t1 minutes, the first set times are repeated in sequence, if the upper limit value is not reached, the pneumatic diaphragm pump 7 stops working, the water system fault is reported, and the system can be restored to normal working only if the system is manually reset. Among them, t1 is preferably 5 minutes, t2 is preferably 1 minute, and the first set number of times is preferably 2 or 3 times.
The control method further comprises a leakage detection step, specifically, when the flow rate of the water supply pipeline 23 is greater than a set flow rate, the flow switch 13 is turned ON (ON), the set flow rate is (1 +/-0.2) L/min, the control system controls the pneumatic diaphragm pump 7 to stop after t3 time, the system returns to normal after waiting for t3 time (namely after two t3 times), the control system controls the pneumatic diaphragm pump 7 to start again, if the control system detects a flow signal lasting for t3 time again, the pneumatic diaphragm pump 7 is controlled to stop, the control system controls the pneumatic diaphragm pump 7 to stop and not start again after repeating a second set number of times, and the system can return to normal operation only if manual reset is needed. Among them, t3 is preferably 3 minutes, the second set number of times is preferably 2 or 3 times, and if the flow switch 13 is turned OFF (OFF) in the 0min to t3 or two t3 to three t3 times, the water supply system automatically returns to normal.
When the system is powered off, the water inlet pneumatic control valve 19 is closed, the first emptying pneumatic control valve 5 and the second emptying pneumatic control valve 10 are opened, and water stored in the water inlet pipeline 22 and the water supply pipeline 23 is emptied.
After the system receives the anti-freezing emptying signal, the pneumatic diaphragm pump 7 stops working, the water inlet pneumatic control valve 19 is closed, the first emptying pneumatic control valve 5 and the second emptying pneumatic control valve 10 are opened, and the water storage in the water inlet pipeline 22, the water supply pipeline 23 and the water tank 1 is emptied. After the water tank 1 is emptied, the pneumatic diaphragm pump 7 is controlled to continuously work for t4 time, the pneumatic diaphragm pump 7 stops working, and the stored water in the pneumatic diaphragm pump 7 is emptied. Among them, t4 is preferably 5 minutes.
In the process, if the control system detects that the air source pressure is too low, the system stops and reports the fault of the too low air source pressure, and the system automatically resets after the fault is recovered. When the 0% liquid level switch 20 of the water tank 1 is conducted, the system stops and reports that the water tank 1 is not water, and the system automatically resets after the fault is recovered.
In case of system failure, the manual emptying valve 28 can be opened manually to supply air to the pneumatic diaphragm pump 7 manually to discharge the water stored in the pump chamber.
The utility model provides a water supply system utilizes the electric water pump among the pneumatic diaphragm pump replacement prior art, makes system architecture simpler, and the cost is lower, and solenoid valve case scale deposit and lead to solenoid valve jamming scheduling problem when effectively having avoided adopting electric water pump ensures that water supply system job stabilization is reliable, and the fault rate is lower.
As described above, similar technical solutions can be derived from the solutions given in the figures and the embodiments. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention are still within the scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a water supply system for rail vehicle, includes water tank and water pump, the water tank passes through the inlet channel and is connected with the water pump, the water pump passes through the supply channel and is connected its characterized in that with water equipment: the water pump is a pneumatic diaphragm pump, the pneumatic diaphragm pump is connected with an air pump electromagnetic valve, and the air pump electromagnetic valve is connected with a vehicle air source through an air supply pipeline and is connected with a control system through a line.
2. The water supply system for a railway vehicle as claimed in claim 1, wherein: the water inlet pneumatic control valve is installed on the water inlet pipeline and connected with a water inlet pneumatic control electromagnetic valve, and the water inlet pneumatic control electromagnetic valve is connected with a control system through a pipeline and connected with a vehicle air source through an air supply pipeline.
3. The water supply system for a railway vehicle as claimed in claim 1, wherein: the water inlet pipeline is connected with a first emptying pipe, the first emptying pipe is provided with a first emptying pneumatic control valve, the first emptying pneumatic control valve is connected with a first emptying electromagnetic valve, and the first emptying electromagnetic valve is connected with a control system through a pipeline and is connected with a vehicle air source through an air supply pipeline.
4. The water supply system for a railway vehicle as claimed in claim 1, wherein: and the second emptying pipe is connected to the water supply pipeline, second emptying pneumatic control valves are respectively installed on the second emptying pipes, the second emptying pneumatic control valves are connected with second emptying electromagnetic valves, and the second emptying electromagnetic valves are respectively connected with the control system through pipelines and the vehicle air source through the air supply pipeline.
5. The water supply system for a railway vehicle as claimed in claim 4, wherein: the set air pressure of the second emptying pneumatic control valve is N times of the maximum water pressure set value in the water supply pipeline, and when the water pressure reaches the maximum water pressure set value, the second emptying pneumatic control valve is opened passively to release the pressure.
6. The water supply system for a railway vehicle as claimed in claim 1, wherein: and an air source pressure switch is arranged on the air supply pipeline and is connected with the control system.
7. The water supply system for a railway vehicle as claimed in claim 1, wherein: and a water pressure switch is arranged on the water supply pipeline and is connected with a control system.
8. The water supply system for a railway vehicle as claimed in claim 1, wherein: and a flow switch is arranged on the water supply pipeline and is connected with a control system.
9. The water supply system for a railway vehicle as claimed in claim 1, wherein: and a manual emptying valve for manually emptying the water pump when the system fails is arranged on an air supply pipeline of the water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922131310.8U CN211549944U (en) | 2019-12-03 | 2019-12-03 | Water supply system for rail vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922131310.8U CN211549944U (en) | 2019-12-03 | 2019-12-03 | Water supply system for rail vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211549944U true CN211549944U (en) | 2020-09-22 |
Family
ID=72503963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922131310.8U Active CN211549944U (en) | 2019-12-03 | 2019-12-03 | Water supply system for rail vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211549944U (en) |
-
2019
- 2019-12-03 CN CN201922131310.8U patent/CN211549944U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111140476A (en) | Water supply system for railway vehicle and control method thereof | |
| CN204150039U (en) | A kind of guideway vehicle water supply system | |
| CN105804164A (en) | Energy-saving type frequency conversion water supply equipment with monitoring function and purification function | |
| CN210941760U (en) | Novel anti-freezing emptying system of locomotive toilet for high and cold | |
| CN101204960A (en) | Railroad coach tank system water pump hydropenia protected controlled device and method | |
| CN211549944U (en) | Water supply system for rail vehicle | |
| CN209274591U (en) | A kind of pneumatic control water system for the vehicles | |
| CN208498485U (en) | A kind of water system | |
| CN205524305U (en) | Water supply system for EMUs | |
| CN108222130B (en) | Intelligent adjustment method for water tank water injection by using intermittent water supplementing intelligent adjustment device | |
| CN110563187A (en) | Motor car buck recycling system | |
| CN110539765A (en) | Novel compact transfer type vacuum excrement collector | |
| CN202832906U (en) | Pneumatic tank fuel supply system | |
| CN206189520U (en) | Water pump auto change over device | |
| CN218949189U (en) | Water supply system for railway vehicle and toilet | |
| KR930005334B1 (en) | Apparatus for supplying air for water tank | |
| CN212841871U (en) | Small-range pressure regulating and overpressure draining recovery system based on embedded controller | |
| CN201421213Y (en) | Pipeline evacuating and water saving system of solar water heater | |
| CN113415302A (en) | Vacuum excrement collecting system with transfer box and operation method | |
| CN111169499A (en) | Modularized vacuum transfer type excrement collecting system for railway vehicle | |
| CN2175262Y (en) | Water supply arrangement with air regulator for domestic use and fire-fighting | |
| CN220142494U (en) | Fire-fighting water supply system and air film coal yard fire-fighting system | |
| CN219192195U (en) | Antifreezing emptying device of water supply system of vehicle toilet | |
| CN208604676U (en) | A kind of city secondary booster pump station water pump automatic-control exhaust apparatus | |
| CN203756514U (en) | Standby lubrication water supply device for water lubrication bearing draining pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |